Fix preview handlers failing when PowerToys installed in paths with spaces

[Copilot]

Summary

This PR fixes preview handlers not working when PowerToys is installed in directories containing spaces, such as C:\Users\leilzh\AppData\Local\PowerToys.

Problem

The issue was that registry command entries for preview handlers were not properly quoting executable paths. When Windows attempts to execute an unquoted command containing spaces, it interprets the space as an argument separator, causing the preview handler to fail to launch.

Root Cause

In src/common/utils/modulesRegistry.h, the registry commands were constructed like this:

// Before (broken with spaces in path)
std::wstring command = appPath + L" \"----ms-protocol:...\"";
std::wstring command = installationDir + L"\\WinUI3Apps\\PowerToys.RegistryPreview.exe \"%1\"";

This resulted in registry entries like:

C:\Users\leilzh\AppData\Local\PowerToys\WinUI3Apps\PowerToys.RegistryPreview.exe "%1"

Windows would try to execute C:\Users\leilzh\AppData\Local\PowerToys\WinUI3Apps\PowerToys.RegistryPreview.exe as separate arguments:

• C:\Users\leilzh\AppData\Local\PowerToys\WinUI3Apps\PowerToys.RegistryPreview.exe
• (rest of command)

Solution

Added proper quoting around the executable path:

// After (fixed with proper quoting)
std::wstring command = L"\"" + appPath + L"\" \"----ms-protocol:...\"";
std::wstring command = L"\"" + installationDir + L"\\WinUI3Apps\\PowerToys.RegistryPreview.exe\" \"%1\"";

This results in properly quoted registry entries:

"C:\Users\leilzh\AppData\Local\PowerToys\WinUI3Apps\PowerToys.RegistryPreview.exe" "%1"

Changes Made

• Fixed getRegistryPreviewSetDefaultAppChangeSet() to properly quote the executable path
• Fixed getRegistryPreviewChangeSet() to properly quote the executable path

Testing

• Verified syntax compilation
• Tested path construction logic with spaces in directory names
• Confirmed the fix produces properly quoted command strings

Fixes #24.

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[lei9444]

我说的是preview pane的东西

[lei9444]

我说的是preview pane的东西

[lei9444]

我说的是preview pane的东西